mirror of
https://github.com/id-Software/DOOM-3-BFG.git
synced 2024-12-02 17:02:17 +00:00
286 lines
8.2 KiB
C++
286 lines
8.2 KiB
C++
/*
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===========================================================================
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Doom 3 BFG Edition GPL Source Code
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Copyright (C) 1993-2012 id Software LLC, a ZeniMax Media company.
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This file is part of the Doom 3 BFG Edition GPL Source Code ("Doom 3 BFG Edition Source Code").
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Doom 3 BFG Edition Source Code is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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Doom 3 BFG Edition Source Code is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Doom 3 BFG Edition Source Code. If not, see <http://www.gnu.org/licenses/>.
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In addition, the Doom 3 BFG Edition Source Code is also subject to certain additional terms. You should have received a copy of these additional terms immediately following the terms and conditions of the GNU General Public License which accompanied the Doom 3 BFG Edition Source Code. If not, please request a copy in writing from id Software at the address below.
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If you have questions concerning this license or the applicable additional terms, you may contact in writing id Software LLC, c/o ZeniMax Media Inc., Suite 120, Rockville, Maryland 20850 USA.
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===========================================================================
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*/
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#ifndef __MATH_EXTRAPOLATE_H__
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#define __MATH_EXTRAPOLATE_H__
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/*
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==============================================================================================
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Extrapolation
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==============================================================================================
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*/
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typedef enum
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{
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EXTRAPOLATION_NONE = 0x01, // no extrapolation, covered distance = duration * 0.001 * ( baseSpeed )
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EXTRAPOLATION_LINEAR = 0x02, // linear extrapolation, covered distance = duration * 0.001 * ( baseSpeed + speed )
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EXTRAPOLATION_ACCELLINEAR = 0x04, // linear acceleration, covered distance = duration * 0.001 * ( baseSpeed + 0.5 * speed )
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EXTRAPOLATION_DECELLINEAR = 0x08, // linear deceleration, covered distance = duration * 0.001 * ( baseSpeed + 0.5 * speed )
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EXTRAPOLATION_ACCELSINE = 0x10, // sinusoidal acceleration, covered distance = duration * 0.001 * ( baseSpeed + sqrt( 0.5 ) * speed )
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EXTRAPOLATION_DECELSINE = 0x20, // sinusoidal deceleration, covered distance = duration * 0.001 * ( baseSpeed + sqrt( 0.5 ) * speed )
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EXTRAPOLATION_NOSTOP = 0x40 // do not stop at startTime + duration
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} extrapolation_t;
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template< class type >
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class idExtrapolate
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{
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public:
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idExtrapolate();
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void Init( const int startTime, const int duration, const type& startValue, const type& baseSpeed, const type& speed, const extrapolation_t extrapolationType );
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type GetCurrentValue( int time ) const;
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type GetCurrentSpeed( int time ) const;
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bool IsDone( int time ) const
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{
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return ( !( extrapolationType & EXTRAPOLATION_NOSTOP ) && time >= startTime + duration );
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}
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void SetStartTime( int time )
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{
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startTime = time;
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}
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int GetStartTime() const
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{
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return startTime;
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}
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int GetEndTime() const
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{
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return ( !( extrapolationType & EXTRAPOLATION_NOSTOP ) && duration > 0 ) ? startTime + duration : 0;
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}
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int GetDuration() const
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{
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return duration;
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}
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void SetStartValue( const type& value )
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{
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startValue = value;
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}
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const type& GetStartValue() const
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{
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return startValue;
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}
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const type& GetBaseSpeed() const
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{
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return baseSpeed;
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}
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const type& GetSpeed() const
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{
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return speed;
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}
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extrapolation_t GetExtrapolationType() const
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{
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return extrapolationType;
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}
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private:
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extrapolation_t extrapolationType;
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int startTime;
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int duration;
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type startValue;
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type baseSpeed;
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type speed;
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};
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/*
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====================
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idExtrapolate::idExtrapolate
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====================
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*/
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template< class type >
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ID_INLINE idExtrapolate<type>::idExtrapolate()
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{
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extrapolationType = EXTRAPOLATION_NONE;
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startTime = duration = 0.0f;
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memset( &startValue, 0, sizeof( startValue ) );
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memset( &baseSpeed, 0, sizeof( baseSpeed ) );
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memset( &speed, 0, sizeof( speed ) );
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}
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/*
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====================
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idExtrapolate::Init
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====================
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*/
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template< class type >
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ID_INLINE void idExtrapolate<type>::Init( const int startTime, const int duration, const type& startValue, const type& baseSpeed, const type& speed, const extrapolation_t extrapolationType )
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{
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this->extrapolationType = extrapolationType;
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this->startTime = startTime;
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this->duration = duration;
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this->startValue = startValue;
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this->baseSpeed = baseSpeed;
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this->speed = speed;
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}
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/*
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====================
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idExtrapolate::GetCurrentValue
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====================
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*/
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template< class type >
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ID_INLINE type idExtrapolate<type>::GetCurrentValue( int time ) const
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{
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if( time < startTime )
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{
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return startValue;
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}
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if( !( extrapolationType & EXTRAPOLATION_NOSTOP ) && ( time > startTime + duration ) )
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{
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time = startTime + duration;
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}
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switch( extrapolationType & ~EXTRAPOLATION_NOSTOP )
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{
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case EXTRAPOLATION_NONE:
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{
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const float deltaTime = ( time - startTime ) * 0.001f;
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return startValue + deltaTime * baseSpeed;
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}
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case EXTRAPOLATION_LINEAR:
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{
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const float deltaTime = ( time - startTime ) * 0.001f;
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return startValue + deltaTime * ( baseSpeed + speed );
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}
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case EXTRAPOLATION_ACCELLINEAR:
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{
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if( duration == 0 )
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{
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return startValue;
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}
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else
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{
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const float deltaTime = ( time - startTime ) / ( float )duration;
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const float s = ( 0.5f * deltaTime * deltaTime ) * ( ( float )duration * 0.001f );
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return startValue + deltaTime * baseSpeed + s * speed;
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}
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}
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case EXTRAPOLATION_DECELLINEAR:
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{
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if( duration == 0 )
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{
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return startValue;
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}
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else
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{
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const float deltaTime = ( time - startTime ) / ( float )duration;
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const float s = ( deltaTime - ( 0.5f * deltaTime * deltaTime ) ) * ( ( float )duration * 0.001f );
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return startValue + deltaTime * baseSpeed + s * speed;
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}
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}
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case EXTRAPOLATION_ACCELSINE:
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{
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if( duration == 0 )
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{
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return startValue;
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}
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else
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{
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const float deltaTime = ( time - startTime ) / ( float )duration;
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const float s = ( 1.0f - idMath::Cos( deltaTime * idMath::HALF_PI ) ) * ( float )duration * 0.001f * idMath::SQRT_1OVER2;
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return startValue + deltaTime * baseSpeed + s * speed;
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}
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}
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case EXTRAPOLATION_DECELSINE:
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{
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if( duration == 0 )
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{
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return startValue;
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}
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else
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{
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const float deltaTime = ( time - startTime ) / ( float )duration;
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const float s = idMath::Sin( deltaTime * idMath::HALF_PI ) * ( float )duration * 0.001f * idMath::SQRT_1OVER2;
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return startValue + deltaTime * baseSpeed + s * speed;
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}
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}
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}
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return startValue;
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}
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/*
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====================
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idExtrapolate::GetCurrentSpeed
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====================
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*/
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template< class type >
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ID_INLINE type idExtrapolate<type>::GetCurrentSpeed( int time ) const
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{
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if( time < startTime || duration == 0 )
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{
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return ( startValue - startValue ); //-V501
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}
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if( !( extrapolationType & EXTRAPOLATION_NOSTOP ) && ( time > startTime + duration ) )
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{
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return ( startValue - startValue ); //-V501
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}
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switch( extrapolationType & ~EXTRAPOLATION_NOSTOP )
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{
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case EXTRAPOLATION_NONE:
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{
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return baseSpeed;
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}
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case EXTRAPOLATION_LINEAR:
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{
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return baseSpeed + speed;
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}
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case EXTRAPOLATION_ACCELLINEAR:
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{
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const float deltaTime = ( time - startTime ) / ( float )duration;
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const float s = deltaTime;
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return baseSpeed + s * speed;
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}
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case EXTRAPOLATION_DECELLINEAR:
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{
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const float deltaTime = ( time - startTime ) / ( float )duration;
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const float s = 1.0f - deltaTime;
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return baseSpeed + s * speed;
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}
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case EXTRAPOLATION_ACCELSINE:
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{
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const float deltaTime = ( time - startTime ) / ( float )duration;
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const float s = idMath::Sin( deltaTime * idMath::HALF_PI );
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return baseSpeed + s * speed;
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}
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case EXTRAPOLATION_DECELSINE:
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{
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const float deltaTime = ( time - startTime ) / ( float )duration;
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const float s = idMath::Cos( deltaTime * idMath::HALF_PI );
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return baseSpeed + s * speed;
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}
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default:
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{
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return baseSpeed;
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}
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}
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}
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#endif /* !__MATH_EXTRAPOLATE_H__ */
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